<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<form action="http://192.168.3.12:3000/test" method="post">
  <input type="text" name="username">
  <input type="text" name="password">
  <input type="submit" value="提交">
</form>
</body>
</html>